CN107059385B - Decoloring method for improving strength of colored velvet - Google Patents
Decoloring method for improving strength of colored velvet Download PDFInfo
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- CN107059385B CN107059385B CN201710249317.2A CN201710249317A CN107059385B CN 107059385 B CN107059385 B CN 107059385B CN 201710249317 A CN201710249317 A CN 201710249317A CN 107059385 B CN107059385 B CN 107059385B
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Abstract
The invention relates to a decoloring method for improving the strength of colored velvet, and belongs to the technical field of textile printing and dyeing pretreatment processes. The method adopts the solution formed by mixing the high-proportion ethanol, a small amount of water and the degumming reagent to decolorize the colored velvet, can effectively improve the solubility of the pigment, reduce the difficulty of decolorizing the colored velvet, greatly reduce the loss of strength to the colored velvet fiber, improve the quality of the colored velvet, and have high quality and high efficiency. The colored velvet decoloring process is simple and convenient, the decoloring effect is good, the efficiency is high, the using amount of water and the using amount of chemical reagents are obviously reduced in the decoloring process of the colored velvet, the ethanol is safe and non-toxic, can be recycled, and is small in pollution, low in cost, clean, energy-saving, safe and environment-friendly.
Description
Technical Field
The invention relates to a method for improving the strength of colored velvet, belonging to the technical field of textile printing and dyeing pretreatment processes.
Background
Some of the animal fibers have natural color, especially some special animal fibers with large yield in China, such as purple cashmere, grey cashmere, yakwool, camel wool and the like, but the development of color and color varieties is influenced due to the limitation of the natural color. Therefore, a decoloring treatment is required before these expensive special animal fibers are dyed. In the decoloring process, a mordant dyeing-oxidation-reduction method is usually adopted to decolor the colored velvet, however, in the conventional decoloring process, water is usually adopted as a solvent of a chemical reagent, the colored velvet decolored by a water system has large strength damage, the subsequent textile processing process is seriously influenced, and the spinning efficiency is reduced.
With the progress of scientific technology and the enhancement of environmental awareness of people, a plurality of novel efficient and environmental-friendly decolorization methods have become the key points of research.
The decoloring process of purple cashmere and grey cashmere is researched in the publication journal wool spinning technology, published by 2013, volume 41, No. 10, entitled colored cashmere decoloring process, although the adopted decoloring auxiliary agent can successfully decolor various colored fluff and obtain a white product. However, it is disadvantageous that the method does not improve the pile strength.
The method of the purple cashmere decoloring process is discussed in the journal of the university of inner Mongolia journal, published date 2002, volume 21, phase 1, namely, experimental research and dyeing property analysis of the purple cashmere decoloring process, and how to reduce the damage of the fiber strength to the maximum extent in the decoloring process is researched at the same time. However, it has disadvantages in that the concentration of the chemical agent required is large and the amount of water used cannot be reduced to a great extent.
The invention discloses a purple velvet decoloring method and a method for decoloring purple velvet fibers, wherein the Chinese patent application publication No. CN105177990A is published on 2015, 12 and 23 days. Although the method for carrying out acid washing, fumigating and decoloring on the purple velvet by adopting organic solvents such as 3-butoxy-1-propanol and the like really achieves the effect of reducing the color residual rate of the purple velvet, the method has the defects that the acid washing solution and the decoloring solution of the method are more in types of organic solvents and other chemical additives, the preparation is more complex, the cost is more, and the recovery is difficult.
The invention discloses an improved purple velvet decoloring method which is invented and created by Chinese patent application publication No. CN105177984A on the date of application publication 2015, 12 and 23 and is named as 'an improved purple velvet decoloring method', and the application discloses a method for decoloring purple velvet fibers. Although the decoloring method adopting pigment separation and protection, purple velvet protection and stabilization, purple velvet reduction bleaching and purple velvet reduction protection really plays roles of simplifying the decoloring process and reducing the production cost, the decoloring process has the defects that a specially-made T1 pigment separating agent, a T2 wool protective agent, a T4 complexing agent, a T5 oxidation stabilizer and the like are required to be added in the decoloring process, and the formula is complex.
The invention provides a method for decoloring cyan velvet, which is a method for decoloring cyan velvet fibers and is invented and created by Chinese patent application publication No. CN103882722A on 25/06/2014. Although the decoloring method of acid washing, pretreatment, oxygen bleaching and reduction bleaching is adopted to really improve the whiteness of the grey wool and reduce the strong damage, the method has the defects that the mercerizing protease, the organic phosphonic acid and the sodium salt thereof with certain concentration are required to be added in the decoloring process, the cost is increased to a certain extent, and certain limitation exists.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for decoloring colored pile using a solution in which a large amount of ethanol and a small amount of water are mixed with a decoloring agent, in order to improve the decoloring effect and the strength of the colored pile after decoloring.
In order to achieve the purpose, the technical solution of the invention is as follows:
a method for improving the strength of decolorization of colored wool comprises the following steps of pretreatment, oxidation bleaching and reduction bleaching in a decolorization process of the colored wool:
the pretreatment is carried out by putting colored velvet into pretreatment liquid formed by mixing ethanol, water and mordant, wherein the bath ratio of the pretreatment liquid is 1: 10-1: 100, the volume ratio of the ethanol to the water in the pretreatment liquid is 90% -10% -50%, the concentration of the mordant is 2-8 g/L, the temperature of the pretreatment liquid is 45-65 ℃, and the treatment time is 20-60 minutes;
the oxidative bleaching is to perform oxidative bleaching treatment on the pretreated colored velvet in an oxygen bleaching solution formed by mixing ethanol, water and hydrogen peroxide, wherein the bath ratio of the oxygen bleaching solution is 1: 10-1: 100, the volume ratio of the ethanol to the water in the oxygen bleaching solution is 100%, 0% -60%, 40%, the concentration of the hydrogen peroxide is 5-25 g/L, the temperature of the oxygen bleaching solution is 35-75 ℃, and the oxidative bleaching time is 20-100 minutes;
the reduction bleaching is to put the colored velvet after oxidation bleaching into a reducing solution formed by mixing ethanol, water and a reducing agent for reduction bleaching, wherein the bath ratio of the reducing solution is 1: 10-1: 100, the volume ratio of the ethanol to the water in the reducing solution is 10%: 90% -40%: 60%, the concentration of the reducing agent is 5-20 g/L, the temperature of the reduction bleaching solution is 30-70 ℃, and the reduction bleaching time is 10-60 minutes.
The colored down is one of green down, purple down, camel down, yak down or down.
The mordant is one of ferrous sulfate, copper sulfate or cobaltous sulfate.
The reducing agent is one of sodium hydrosulfite or thiourea dioxide.
Due to the adoption of the technical scheme, the invention is technically characterized in that: the invention adopts a method for decoloring colored velvet by adopting a solution formed by mixing high-proportion ethanol, a small amount of water and a degumming reagent, and can obviously improve the osmosis effect of ferrous salt by adding the high-proportion ethanol, so that a stable complex can be formed by pigment and the ferrous salt, and then the ferrous salt can directionally catalyze hydrogen peroxide and Fe under the action of the hydrogen peroxide2++H2O2→Fe3++HO·+OH-，Fe2++HO·→Fe3++OH-,H2O2+HO·→HO2·+H2O,Fe2++HO2·→Fe3++HO2 -,Fe3++HO2·→Fe2++H++O2HO produced by decomposition of hydrogen peroxide2The double bonds of the pigments can be neutralized, so that the pigments contained in the colored velvet can be removed. The oxygen bleaching liquid contains ethanol with high proportion, so that hydrogen peroxide can act on pigments to the maximum extent, and the damage to the disulfide bonds of the fibers is relatively light, so that the strong damage to the fibers is very light, and the strong damage to the colored velvet fibers can be effectively reduced. Can effectively improve the solubility of the pigment, and solves the problems of difficult decolorization, large water consumption and great strength damage of the colored velvet fibers in the traditional colored velvet decolorization process.
According to the method for improving the strength of the colored velvet, the solution formed by mixing the high-proportion ethanol, a small amount of water and the decolorizing reagent is adopted to decolorize the colored velvet, so that the pigment solubility can be effectively improved, the decolorizing difficulty of the colored velvet is reduced, the strength loss of the colored velvet is greatly reduced, the quality of the colored velvet is improved, and the colored velvet is high in quality and efficiency. The decoloring process is simple and convenient, the decoloring effect is good, the efficiency is high, the using amount of water and the using amount of chemical reagents are obviously reduced in the whole decoloring process, and the ethanol can be recycled, so that the decoloring process is low in pollution, low in cost, clean, energy-saving, safe and environment-friendly.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The invention discloses a decoloring method for improving the strength of colored down, wherein the colored down to be decolored is one of green down, purple down, camel down, yak down or down, and the decoloring method for improving the strength of the colored down comprises the following specific steps:
a pretreatment
The colored velvet is placed in a pretreatment liquid formed by mixing ethanol, water and a mordant for pretreatment, wherein the bath ratio of the pretreatment liquid is 1: 10-1: 100, the volume ratio of the ethanol to the water in the pretreatment liquid is 90% to 10% -50% to 50%, the concentration of the mordant is 2-8 g/L, the temperature of the pretreatment liquid is 45-65 ℃, the treatment time is 20-60 minutes, and the mordant is one of ferrous sulfate, copper sulfate or cobaltous sulfate.
b oxidative bleaching
And (2) placing the pretreated colored velvet into an oxygen bleaching solution formed by mixing ethanol, water and hydrogen peroxide for oxidation bleaching treatment, wherein the bath ratio of the oxygen bleaching solution is 1: 10-1: 100, the volume ratio of the ethanol to the water in the oxygen bleaching solution is 100%, 0-60% to 40%, the concentration of the hydrogen peroxide is 5-25 g/L, the temperature of the oxidation bleaching solution is 35-75 ℃, and the oxidation bleaching time is 20-100 minutes.
c reductive bleaching
And (2) placing the colored velvet after the oxidation bleaching treatment into a reducing solution formed by mixing ethanol, water and a reducing agent for reduction bleaching treatment, wherein the bath ratio of the reducing solution is 1: 10-1: 100, the volume ratio of the ethanol to the water in the reducing solution is 10%: 90% -40%: 60%, the concentration of the reducing agent is 5-20 g/L, the temperature of the reduction bleaching solution is 30-70 ℃, and the reduction bleaching time is 10-60 minutes. The reducing agent is one of sodium hydrosulfite or thiourea dioxide.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example one
The method comprises the following steps: 1g of green velvet is selected for decoloring, the green velvet is put into a pretreatment liquid formed by mixing ethanol, water and ferrous sulfate for pretreatment, wherein the bath ratio of the pretreatment liquid is 1:10, the volume ratio of the ethanol to the water in the pretreatment liquid is 90% to 10%, the concentration of the ferrous sulfate is 2/L, the temperature of the pretreatment liquid is 45 ℃, and the treatment time is 60 minutes. And (2) placing the pretreated grey wool into an oxygen bleaching solution formed by mixing ethanol, water and hydrogen peroxide for oxidation bleaching treatment, wherein the bath ratio of the oxygen bleaching solution is 1:10, the volume ratio of the ethanol to the water in the oxygen bleaching solution is 100% to 0%, the concentration of the hydrogen peroxide is 5g/L, the temperature of the oxidation bleaching solution is 35 ℃, and the oxidation bleaching time is 100 minutes. And (2) putting the oxidized and bleached grey wool into a reducing solution formed by mixing ethanol, water and sodium hydrosulfite for reduction bleaching treatment, wherein the bath ratio of the reducing solution is 1:10, the volume ratio of the ethanol to the water in the reducing solution is 10 to 90 percent, the concentration of the sodium hydrosulfite is 20g/L, the temperature of the reduction bleaching solution is 30 ℃, and the reduction bleaching time is 60 minutes.
Example two
The method comprises the following steps: 1g of purple wool is selected for decolorization, and the purple wool is put into a pretreatment solution formed by mixing ethanol, water and copper sulfate for pretreatment, wherein the bath ratio of the pretreatment solution is 1:100, the volume ratio of the ethanol to the water in the pretreatment solution is 50 percent to 50 percent, the concentration of the copper sulfate is 8g/L, the temperature of the pretreatment solution is 65 ℃, and the treatment time is 20 minutes. And (2) placing the pretreated purple velvet into an oxygen bleaching solution formed by mixing ethanol, water and hydrogen peroxide for oxidation bleaching treatment, wherein the bath ratio of the oxygen bleaching solution is 1:100, the volume ratio of the ethanol to the water in the oxygen bleaching solution is 60 to 40 percent, the concentration of the hydrogen peroxide is 25g/L, the temperature of the oxidation bleaching solution is 75 ℃, and the oxidation bleaching time is 20 minutes. And (3) placing the oxidized and bleached purple wool into a reducing solution formed by mixing ethanol, water and thiourea dioxide for reduction bleaching treatment, wherein the bath ratio of the reducing solution is 1:100, the volume ratio of the ethanol to the water in the reducing solution is 40 to 60 percent, the concentration of the thiourea dioxide is 5g/L, the temperature of the reduction bleaching solution is 70 ℃, and the reduction bleaching time is 10 minutes.
EXAMPLE III
The method comprises the following steps: 1g of camel hair is selected for decolorization, and the camel hair is put into a pretreatment liquid formed by mixing ethanol, water and cobaltous sulfate for pretreatment, wherein the bath ratio of the pretreatment liquid is 1:50, the volume ratio of the ethanol to the water in the pretreatment liquid is 75 percent to 25 percent, the concentration of the cobaltous sulfate is 4g/L, the temperature of the pretreatment liquid is 55 ℃, and the treatment time is 40 minutes. Putting the pretreated camel hair into an oxygen bleaching solution formed by mixing ethanol, water and hydrogen peroxide for oxidation bleaching treatment, wherein the bath ratio of the oxygen bleaching solution is 1:50, the volume ratio of the ethanol to the water in the oxygen bleaching solution is 75-25%, the concentration of the hydrogen peroxide is 10g/L, the temperature of the oxidation bleaching solution is 50 ℃, and the oxidation bleaching time is 60 minutes. And (2) putting the camel hair subjected to oxidation bleaching treatment into a reducing solution formed by mixing ethanol, water and sodium hydrosulfite for reduction bleaching treatment, wherein the bath ratio of the reducing solution is 1:50, the volume ratio of the ethanol to the water in the reducing solution is 25 to 75 percent, the concentration of the sodium hydrosulfite is 10g/L, the temperature of the reduction bleaching solution is 45 ℃, and the reduction bleaching time is 40 minutes.
Example four
The method comprises the following steps: the method comprises the steps of selecting 1g of yakwool for decolorization, placing the yakwool into a pretreatment liquid formed by mixing ethanol, water and ferrous sulfate for pretreatment, wherein the bath ratio of the pretreatment liquid is 1:10, the volume ratio of the ethanol to the water in the pretreatment liquid is 90% to 10%, the concentration of the ferrous sulfate is 2g/L, the temperature of the pretreatment liquid is 45 ℃, the treatment time is 20 minutes, placing the pretreated yakwool into an oxygen bleaching liquid formed by mixing the ethanol, the water and hydrogen peroxide for oxidative bleaching, wherein the bath ratio of the oxygen bleaching liquid is 1:10, the volume ratio of the ethanol to the water in the oxygen bleaching liquid is 100% to 0%, the concentration of the hydrogen peroxide is 5g/L, the temperature of the oxidative bleaching liquid is 35 ℃, and the oxidative bleaching time is 20 minutes. And (2) placing the yakwool subjected to oxidation bleaching treatment in a reducing solution formed by mixing ethanol, water and thiourea dioxide for reduction bleaching treatment, wherein the bath ratio of the reducing solution is 1:10, the volume ratio of the ethanol to the water in the reducing solution is 10% to 90%, the concentration of a reducing agent is 5g/L, the temperature of the reduction bleaching solution is 30 ℃, and the reduction bleaching time is 10 minutes.
EXAMPLE five
The method comprises the following steps: 1g of down feather is selected for decolorization, and the down feather is placed in a pretreatment liquid formed by mixing ethanol, water and copper sulfate for pretreatment, wherein the bath ratio of the pretreatment liquid is 1:60, the volume ratio of the ethanol to the water in the pretreatment liquid is 60% to 40%, the concentration of the copper sulfate is 4g/L, the temperature of the pretreatment liquid is 60 ℃, and the treatment time is 30 minutes. And (2) placing the pretreated down into an oxygen bleaching solution formed by mixing ethanol, water and hydrogen peroxide for oxidation bleaching treatment, wherein the bath ratio of the oxygen bleaching solution is 1:60, the volume ratio of the ethanol to the water in the oxygen bleaching solution is 80 to 20 percent, the concentration of the hydrogen peroxide is 15g/L, the temperature of the oxidation bleaching solution is 60 ℃, and the oxidation bleaching time is 50 minutes. And (2) placing the oxidized and bleached down into a reducing solution formed by mixing ethanol, water and sodium hydrosulfite for reducing and bleaching, wherein the bath ratio of the reducing solution is 1:60, the volume ratio of the ethanol to the water in the reducing solution is 30 to 70 percent, the concentration of the sodium hydrosulfite is 15g/L, the temperature of the reducing and bleaching solution is 50 ℃, and the reducing and bleaching time is 30 minutes.
Claims (2)
1. A decoloring method for improving the strength of colored velvet comprises pretreatment, oxidation bleaching and reduction bleaching in a decoloring process of the colored velvet, and is characterized in that:
the pretreatment is carried out by putting colored velvet into pretreatment liquid formed by mixing ethanol, water and mordant, wherein the bath ratio of the pretreatment liquid is 1: 10-1: 100, the volume ratio of the ethanol to the water in the pretreatment liquid is 90% -10% -50%, the concentration of the mordant is 2-8 g/L, the temperature of the pretreatment liquid is 45-65 ℃, and the pretreatment time is 20-60 minutes; the mordant is ferrous sulfate;
the oxidative bleaching is to put the pretreated colored velvet into an oxygen bleaching solution formed by mixing ethanol, water and hydrogen peroxide for oxidative bleaching treatment, wherein the bath ratio of the oxygen bleaching solution is 1: 10-1: 100, the volume ratio of the ethanol to the water in the oxygen bleaching solution is 100%, 0% -60%, 40%, the concentration of the hydrogen peroxide is 5-25 g/L, the temperature of the oxidative bleaching solution is 35-75 ℃, and the oxidative bleaching time is 20-100 minutes;
the reduction bleaching is to put the colored velvet after oxidation bleaching into a reducing solution formed by mixing ethanol, water and a reducing agent for reduction bleaching, wherein the bath ratio of the reducing solution is 1: 10-1: 100, the volume ratio of the ethanol to the water in the reducing solution is 10%: 90% -40%: 60%, the concentration of the reducing agent is 5-20 g/L, the temperature of the reduction bleaching solution is 30-70 ℃, and the reduction bleaching time is 10-60 minutes; the reducing agent is sodium hydrosulfite.
2. A method of improving the decolorization of colored fluff in a strength state according to claim 1, wherein: the colored down is one of green down, purple down, camel down, yak down or down.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108755105A (en) * | 2018-06-14 | 2018-11-06 | 宁夏双维绒制品有限公司 | A kind of decolouring yak hair technique |
| CN109082877A (en) * | 2018-08-27 | 2018-12-25 | 江苏阳光股份有限公司 | A kind of bleaching process of purple cashmere |
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| CN1186136A (en) * | 1996-12-24 | 1998-07-01 | 中国科学院新疆化学研究所 | Method for bleaching special fur by organic solvent |
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